Move empty sort workflow test into workflow test framework.

lib/galaxy_test/api/test_workflows.py

@@ -7184,44 +7184,6 @@ input:
         put_response = self._update_workflow(workflow_id, workflow_object)
         assert put_response.status_code == 200
 
-    def test_empty_collection_sort(self, history_id):
-        self._run_workflow(
-            """class: GalaxyWorkflow
-inputs:
-  input: collection
-  filter_file: data
-steps:
-  filter_collection:
-    tool_id: __FILTER_FROM_FILE__
-    in:
-       input: input
-       how|filter_source: filter_file
-  sort_collection_1:
-    tool_id: __SORTLIST__
-    in:
-      input: filter_collection/output_filtered
-  sort_collection_2:
-    tool_id: __SORTLIST__
-    in:
-      input: filter_collection/output_discarded
-  merge_collection:
-    tool_id: __MERGE_COLLECTION__
-    in:
-      inputs_0|input: sort_collection_1/output
-      inputs_1|input: sort_collection_2/output
-test_data:
-  input:
-    collection_type: list
-    elements:
-      - identifier: i1
-        content: "0"
-  filter_file: i1
-""",
-            history_id=history_id,
-            wait=True,
-            assert_ok=True,
-        )
-
     @skip_without_tool("random_lines1")
     def test_run_replace_params_over_default_delayed(self):
         with self.dataset_populator.test_history() as history_id:

lib/galaxy_test/workflow/empty_collection_sort.gxwf-tests.yml

@@ -0,0 +1,16 @@
+- doc: | 
+    Test to verify collection operations like the sort tool work fine with empty collections.
+  job:
+    input:
+      collection_type: list
+      elements:
+      - identifier: i1
+        content: "0"
+    filter_file: i1
+  outputs:
+    output:
+      elements:
+        i1:
+          asserts:
+          - that: has_text
+            text: "0"

lib/galaxy_test/workflow/empty_collection_sort.gxwf.yml

@@ -0,0 +1,26 @@
+class: GalaxyWorkflow
+inputs:
+  input: collection
+  filter_file: data
+outputs:
+  output:
+    outputSource: merge_collection/output
+steps:
+  filter_collection:
+    tool_id: __FILTER_FROM_FILE__
+    in:
+       input: input
+       how|filter_source: filter_file
+  sort_collection_1:
+    tool_id: __SORTLIST__
+    in:
+      input: filter_collection/output_filtered
+  sort_collection_2:
+    tool_id: __SORTLIST__
+    in:
+      input: filter_collection/output_discarded
+  merge_collection:
+    tool_id: __MERGE_COLLECTION__
+    in:
+      inputs_0|input: sort_collection_1/output
+      inputs_1|input: sort_collection_2/output